Jacob E. Lange was born in Flensburg in 1864. A major part of his life he lived on the Danish island Funen, where he studied and painted species of agarics. From 1935 to 1940 his principal work "Flora Agaricina Danica" was published.

About "Flora Agaricina Danica":
M. Lange (1969). Jacob E. Lange and the creation of "Flora Agaricina Danica". Friesia 9 (1-2): 121-132.

Jacob E. Langes herbarium is situated at Botanical Museum, University of Copenhagen (C).